Multiple-speed handle



Feb. 19; 1924;

M. D. BIKER MULTIPLE SIEED'HANDLE 2 sh ms-sh ia {151 Filed July 23 1921 Svwamboz Ma [calm 27.. R i/f r' WLSQS 2 Sheets-Sheet 2 M. D. RIKER MULTIPLE SPEED HANDLE Febe 19, 1924;

Filed July23 I I oz gwgd MicoimflEZ/ZW Patented Feb. 19, 1.924.

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MALCOLM I). BIKER, OF DOVER, NEW JERSEY, ASSIGNOR TO McKIER'NAN-TERRY DRILL COMPANY, OF DOVER, NEW JERSEY, A CORPORATION OF NEW JERSEY.

MULTIPLE-SPEED HANDLE.

Application filed July 23, 1921. Serial No. 487,207.

To all whom it may concern:

Be it known that I, MALCOLM D. BIKER,

a citizen of the United States, and a resident of Dover, Morris County, and State of New Jersey, have invented certain new and useful Improvements in Multiple-Speed Handles, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

This invention relates to multiple speed jack handles and has for its object the provision of a handle that shall be rugged in construction, simple and reliable in operation, and capableofmanufacture at a minimum cost.

The handle is designed to go on the driving shaft of a standard jack and in its preferred form is so constructed that three speeds may be obtained. The mechanismincludes a circular rack which is slidably locked against rotation to the body of the jack, a second rack which may be locked to the driving shaft, and a gear cage or spider between and operatively connecting the racks and also lockable to the shaft. A pawl is arranged to cooperate with one of the racks or the cage depending on the speed desired. Other features of novelty will appear from the detail description of the invention taken in connection with the accom panying drawings in which,

Fig. 1 is an elevation of a the invention applied thereto.

Fig. 2 is an enlarged view showing a fragment of the jack in plan and the multiple speed jack-handle partly in plan and partly in horizontal section.

jack showing Fig. 3 is view partly in side elevation, and

partly in section, of the jack handle. v

' Fig. 4: is a view similar to Fig. 2 but showing the handle arranged for a different speed.

In the of drawings, like characters reference indicate like parts through. the

and 11 a bar may be inserted. One face of the frame is bored to slip over the shaft 12 while the opposite face is open to receive the gear mechanism making up the handle. l Vithin the frame 15 adjacent the bored face thereof is a disk 17 having a circular rack 18 in one of its faces and having ratchet teeth 19 on its periphery, the disk being bored to slip over the shaft 12 and having a key-way 20 therein to slidably receive a key 21 affixed to the shaft 12 for a purpose hereinafter mentioned. Mounted on the shaft 12 adjacent the disk 17 is a gear cage or spider 22 in which three bevel gears 23 are suitably supported on axes at right angles to that of the shaft 12. The spider is provided on its periphery with ratchet teeth 24 and has a key-way 25 for slidably receiving the aforementioned key 21.

Mounted loose on the shaft 12 is a disk having a circular rack 31 which meshes with the gears 23, said disk having an axially projecting sleeve 32 extending over the boss 11, the sleeve being slotted to receive the boss ridge 13. ,A ring 33 screwed into the frame 15 behind the disk 30 secures the parts in place.

Pivotally and slidably mounted in the frame 15 is a shaft 35 to which is afiixed a double armed pawl 36 which is adapted to cooperate with the teeth either on the disk 17 or cage 22 depending on its position within the frame. Fig. 2 shows the pawl in position to engage the teeth on the disk 17 while Fig. 4 shows it in position to engage the teeth on the gear cage 22. The purpose of this arrangement will be presently explained. The pawl' is pressed upon by spring 37 which serves not only to hold the pawl to the ratchet teeth in either ahead or reverse position but also serves to hold it in either of the positions indicated in Figs. 2 and 4, that is, against either one face or the other of the frame whereby the pawl is positioned for co-operation with either the teeth on the cage 22 or the teeth on the disk 17. The spring seats in a cup-shaped recess 38 in the back of the pawl and reacts against any suitable abutment as a plate 39 in the frame 15. Buckling of the spring is prevented by a rod 40 which passes through the core thereof;

The mode of operation of the device is as follows. In the position of the handle shown in Fig. 4. the rack 31 is locked against rotation by means of the key 13 on the boss 11. The rack 18 is locked to the shaft 12 by means of the key 21 and the pawl 36 is in position to engage the teeth 24 of the gear cage 22. Rotation. of the cage by means of the frame 15 will cause the disk 17 to rotate at twice the speed of the cage by reason of the fact that the spider gears 23 roll 011 the fixed rack 31 and hence cause the rack 18 of the disk 17 to rotate. Since the disk 17 is secured to the shaft by means of the key 21 the shaft will be rotated with the disk as will now be readily understood.

By shiftin the pawl 36 over the teeth 19 on the disk 17 the shaft 12 will be driven direct and the spider 22 will then be a more idler having no function. By reason of the spring 37 reacting against the frame at a point in a line extending through the shaft 35 and the axes of the racks 18 and 81 and midway the latter, the pawl will remain in its adjusted position as will be readily understood, This arrangement of the spring and pawl is an important feature of the invention.

pawl is positioned over the teeth 19 of disk 17 which is now loose on the shaft 12. As the disk 17 is rotated the spider is carried along with it but at one-half the speed thereof since the gears 23 roll on the relatively fixed rack 31 of the disk 30 and on the rack 18 of the disk 17 as will now be readily understood.

It will now be seen that there has been provided a multiple speed handle which permits of three speeds, namely, a direct drive, and a step up and a step down speed. The handle is self contained and may be used with the standard jack construction. The invention is capable of use in various relations and it is therefore to be distinctly understood that no limitations on the invention are intended except as may be imposed by the appended claims.

lVhat I claim is:

1. The combination with a shaft to be turned and a support therefor. of a frame rotatively mounted on the shaft, a pair of oppositely disposed racks supported by the frame, a gear cage between said racks having a gear meshing with said racks, ratchet teeth on said cage and on one of said racks, a pawl supported by the frame and adapted for cooperation with either of said ratchet teeth,means for selectively locking the gear cage or said ratchet-teeth-provided rack to the shaft, and means for locking the other said rack to said support.

2. The combination with a shaft to be turned and a support therefor, of a frame rotatively mounted on the shaft, a rack slidably affixed to said support and secured in the frame, a gear cage mounted on the shaft and carrying gears in-mesh with the rack, a rack oppositely disposed with respect to the first mentioned rack and in mesh with said gears, ratchet teeth on the last mentioned rack and on said cage, a pawl slidably mounted inthe frame and adjustable to position over either of said teeth, and a key in the shaft for locking said last mentioned rack or said cage against rotation.

3. The combination with a shaft to be turned and a support therefor, of a multiple speed handle removably mounted on the shaft and comprising aframe rotable on said shaft, a circular rack slidably locked to said support, a gear cage having a gear in mesh with said rack, ratchet teeth on the periphery of said cage, a circular rack oppositely disposed with respect tothe first mentioned rack and in mesh with said gear, ratchet teeth on the periphery of the last mentioned rack, pawl mechanism mounted in the frame and adapted to be operatively engaged with one or the other of said ratchet teeth, and means for locking the cage or the ratchet teeth provided rack tothe shaft.

4. In combination, a frame having a pair of ratchet members mounted therein, a pawl slrdable 1n the frame for positioning over either of said members, means for holdlng the pawl in a given position comprising a coil spring abutting the frame at a point substantially midway said members and pressing on the back of said pawl whereby said pawl cooperates with said ratchet in a given position.

5. In combination, a frame having a pair of ratchet members mounted therein a shaft slidably supported in the frame, a pawl affixed to the shaft. a spring-support at the back of the pawl above the axis of the shaft, and a coil spring confined on said support and reacting against the frame at a point which lies in a line passing through the axis of said shaft and axis of said members.

i 6. In combination, a-diffcrential gear having a gear cage, an axially movable handle adapted in one of its positions to retain said cage against relative movement with respect the the handle and in the other position to free said cage from said handle, a pawl pivotally mounted on said handle and a single spring acting on said pawl to maintain said pawl and said handle in their respective positions.

In witness whereof I have hereunto set my hand this 21st day of July, 1921.

MALCOLM D. BIKER. 

